A Circuit Analysis Of Current Limiter Powe Supply As Charging System Protection In Batteries

Abstract

Power Supply Current Limiter CircuitThe current limiter to be analyzed works to create an overcurrent protection system and is able to work quickly, when overcurrent occurs due to overload or short circuit. The current limiter circuit uses two transistors configured as a differential pair, combined with a fixed current source to limit the current available to the pass transistor of the voltage regulator. From the research results, it was obtained that the measurement results of the current limiter had been successfully made, namely for a 5 VDC load with a limit of 0.30 A and a 12 VDC load with a limit of 0.7 A. In normal condition testing with a resistor value of more than 16 Ω for a 0.30 A current limiter and a resistor value of more than 20 Ω for a current limiter with a limit of 0.7 A, the output current of the current limiter has a value based on the resistor load value (Ω), namely the greater the resistor value, the smaller the current will be for a 0.30 A current limiter and for a 0.7 A current limiter. In overcurrent condition testing with a resistor load value smaller than the resistor load under normal conditions, namely less than 18 Ω for a 5 VDC current limiter with a limit of 0.30 A and less than 20 Ω for a 12 VDC current limiter with a limit of 0.7 A, the output current of the current limiter for a 5 VDC load. The output current of the current limiter is in accordance with the current limit in the circuit according to the ability of the synchronous buck converter and the battery and the devices connected to it to withstand the current. In short circuit condition testing, the current limit value is in accordance with the designed limit, namely 0.22A and 0.45A.